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✏️ Editing: h5p-event-dispatcher.js

var H5P = window.H5P = window.H5P || {};

/**
 * The Event class for the EventDispatcher.
 *
 * @class
 * @param {string} type
 * @param {*} data
 * @param {Object} [extras]
 * @param {boolean} [extras.bubbles]
 * @param {boolean} [extras.external]
 */
H5P.Event = function (type, data, extras) {
  this.type = type;
  this.data = data;
  var bubbles = false;

// Is this an external event?
  var external = false;

// Is this event scheduled to be sent externally?
  var scheduledForExternal = false;

if (extras === undefined) {
    extras = {};
  }
  if (extras.bubbles === true) {
    bubbles = true;
  }
  if (extras.external === true) {
    external = true;
  }

/**
   * Prevent this event from bubbling up to parent
   */
  this.preventBubbling = function () {
    bubbles = false;
  };

/**
   * Get bubbling status
   *
   * @returns {boolean}
   *   true if bubbling false otherwise
   */
  this.getBubbles = function () {
    return bubbles;
  };

/**
   * Try to schedule an event for externalDispatcher
   *
   * @returns {boolean}
   *   true if external and not already scheduled, otherwise false
   */
  this.scheduleForExternal = function () {
    if (external && !scheduledForExternal) {
      scheduledForExternal = true;
      return true;
    }
    return false;
  };
};

/**
 * Callback type for event listeners.
 *
 * @callback H5P.EventCallback
 * @param {H5P.Event} event
 */

H5P.EventDispatcher = (function () {

/**
   * The base of the event system.
   * Inherit this class if you want your H5P to dispatch events.
   *
   * @class
   * @memberof H5P
   */
  function EventDispatcher() {
    var self = this;

/**
     * Keep track of listeners for each event.
     *
     * @private
     * @type {Object}
     */
    var triggers = {};

/**
     * Add new event listener.
     *
     * @throws {TypeError}
     *   listener must be a function
     * @param {string} type
     *   Event type
     * @param {H5P.EventCallback} listener
     *   Event listener
     * @param {Object} [thisArg]
     *   Optionally specify the this value when calling listener.
     */
    this.on = function (type, listener, thisArg) {
      if (typeof listener !== 'function') {
        throw TypeError('listener must be a function');
      }

// Trigger event before adding to avoid recursion
      self.trigger('newListener', {'type': type, 'listener': listener});

/**
     * Add new event listener that will be fired only once.
     *
     * @throws {TypeError}
     *   listener must be a function
     * @param {string} type
     *   Event type
     * @param {H5P.EventCallback} listener
     *   Event listener
     * @param {Object} thisArg
     *   Optionally specify the this value when calling listener.
     */
    this.once = function (type, listener, thisArg) {
      if (!(listener instanceof Function)) {
        throw TypeError('listener must be a function');
      }

var once = function (event) {
        self.off(event.type, once);
        listener.call(this, event);
      };

self.on(type, once, thisArg);
    };

/**
     * Remove event listener.
     * If no listener is specified, all listeners will be removed.
     *
     * @throws {TypeError}
     *   listener must be a function
     * @param {string} type
     *   Event type
     * @param {H5P.EventCallback} listener
     *   Event listener
     */
    this.off = function (type, listener) {
      if (listener !== undefined && !(listener instanceof Function)) {
        throw TypeError('listener must be a function');
      }

if (triggers[type] === undefined) {
        return;
      }

if (listener === undefined) {
        // Remove all listeners
        delete triggers[type];
        self.trigger('removeListener', type);
        return;
      }

// Find specific listener
      for (var i = 0; i < triggers[type].length; i++) {
        if (triggers[type][i].listener === listener) {
          triggers[type].splice(i, 1);
          self.trigger('removeListener', type, {'listener': listener});
          break;
        }
      }

// Clean up empty arrays
      if (!triggers[type].length) {
        delete triggers[type];
      }
    };

/**
     * Try to call all event listeners for the given event type.
     *
     * @private
     * @param {string} Event type
     */
    var call = function (type, event) {
      if (triggers[type] === undefined) {
        return;
      }

// Clone array (prevents triggers from being modified during the event)
      var handlers = triggers[type].slice();

// Call all listeners
      for (var i = 0; i < handlers.length; i++) {
        var trigger = handlers[i];
        var thisArg = (trigger.thisArg ? trigger.thisArg : this);
        trigger.listener.call(thisArg, event);
      }
    };

/**
     * Dispatch event.
     *
     * @param {string|H5P.Event} event
     *   Event object or event type as string
     * @param {*} [eventData]
     *   Custom event data(used when event type as string is used as first
     *   argument).
     * @param {Object} [extras]
     * @param {boolean} [extras.bubbles]
     * @param {boolean} [extras.external]
     */
    this.trigger = function (event, eventData, extras) {
      if (event === undefined) {
        return;
      }
      if (event instanceof String || typeof event === 'string') {
        event = new H5P.Event(event, eventData, extras);
      }
      else if (eventData !== undefined) {
        event.data = eventData;
      }

// Check to see if this event should go externally after all triggering and bubbling is done
      var scheduledForExternal = event.scheduleForExternal();

// Call all listeners
      call.call(this, event.type, event);

// Call all * listeners
      call.call(this, '*', event);

// Bubble
      if (event.getBubbles() && self.parent instanceof H5P.EventDispatcher &&
          (self.parent.trigger instanceof Function || typeof self.parent.trigger === 'function')) {
        self.parent.trigger(event);
      }

if (scheduledForExternal) {
        H5P.externalDispatcher.trigger.call(this, event);
      }
    };
  }

return EventDispatcher;
})();

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